0.1t^2+3t=400

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Solution for 0.1t^2+3t=400 equation:


Simplifying
0.1t2 + 3t = 400

Reorder the terms:
3t + 0.1t2 = 400

Solving
3t + 0.1t2 = 400

Solving for variable 't'.

Reorder the terms:
-400 + 3t + 0.1t2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 3t + 0.1t2 = 0

Begin completing the square.  Divide all terms by
0.1 the coefficient of the squared term: 

Divide each side by '0.1'.
-4000 + 30t + t2 = 0

Move the constant term to the right:

Add '4000' to each side of the equation.
-4000 + 30t + 4000 + t2 = 0 + 4000

Reorder the terms:
-4000 + 4000 + 30t + t2 = 0 + 4000

Combine like terms: -4000 + 4000 = 0
0 + 30t + t2 = 0 + 4000
30t + t2 = 0 + 4000

Combine like terms: 0 + 4000 = 4000
30t + t2 = 4000

The t term is 30t.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30t + 225 + t2 = 4000 + 225

Reorder the terms:
225 + 30t + t2 = 4000 + 225

Combine like terms: 4000 + 225 = 4225
225 + 30t + t2 = 4225

Factor a perfect square on the left side:
(t + 15)(t + 15) = 4225

Calculate the square root of the right side: 65

Break this problem into two subproblems by setting 
(t + 15) equal to 65 and -65.

Subproblem 1

t + 15 = 65 Simplifying t + 15 = 65 Reorder the terms: 15 + t = 65 Solving 15 + t = 65 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + t = 65 + -15 Combine like terms: 15 + -15 = 0 0 + t = 65 + -15 t = 65 + -15 Combine like terms: 65 + -15 = 50 t = 50 Simplifying t = 50

Subproblem 2

t + 15 = -65 Simplifying t + 15 = -65 Reorder the terms: 15 + t = -65 Solving 15 + t = -65 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + t = -65 + -15 Combine like terms: 15 + -15 = 0 0 + t = -65 + -15 t = -65 + -15 Combine like terms: -65 + -15 = -80 t = -80 Simplifying t = -80

Solution

The solution to the problem is based on the solutions from the subproblems. t = {50, -80}

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